Looking, I see the 80-400 non AF-S lens for about $1350 and the newer AF-S one for $2300 (which includes the $400 rebate). Big difference. So would the non AF-S lens work good with my D7100 since the d7100 will drive the lens?

How would one be able to figure this out?

Thanks again.

Yes the non AF-S lens would focus on the D7100. The older model goes for around $700 used. I think the safest thing is to rent the new one and try it out. Then buy the old one and compare, sell later if it doesn't meet your needs.

Is the new lens overpriced? Yeah probably but what new lens isn't. It is apparently a good enough lens for pros to make a living on.

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